Question Detail
Question
According to the 'Corrections & Clarifications' section, which phylum is specifically mentioned as showing 'early cephalization' with a primitive 'ladder-type' nervous system and cerebral ganglia?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The 'Corrections & Clarifications' section notes: 'Bilateral symmetry and cephalization: Flatworms show early cephalization...' The 'Phylum Platyhelminthes' section further describes their 'Nervous system: Primitive 'ladder-type' with cerebral ganglia (primitive brain).'
Hint
This phylum represents the simplest triploblastic animals that begin to show a distinct head region.